Use on DTF Printer Tubing with Outside Diameter 1/2" - 3/4" or 12 mm - 18 mm (this includes the DTF PRO MIDI; DTF PRO PANTHERA and many other printers with tubing) in order to better control ink flow or pause ink flow in cases of cleaning or damper change if needed. Made with high quality POM plastic, and with excellent elasticity and clamping force. Adjust the rate of ink flow with great precision. Easy and convenient to use.